Foundry molding flask



Feb. 4, 1930.

E. PLAYER FOUNDRY MOLDING FLASK Filed April 29, 1929 Edward P24 1 [Hg s. '3

' 3 in normal use.

Patented Feb. 4, 1930 d i EDWARD irnnynn, 0114mm; NEAR ivnnna'ronenlvetann f I ronnnny MOLDING FLASK L 1 ,flpplicationfiled n rirzalieae, Serial No. sisao'ssfana in Great Britain'May 18, 1928.

This invention relates to foundry moldin g "flasks, of the kind commonly employed for making'sand molds and provided-witha loeating device at each end by whi'chthe upper one on the other;

V v f f Frequently the locating devices are parallel sided pins which" enter" close fitting parallel r sided holes at each end or the sides of'a flask I pegs l1 whichmay be of identical construe:

section. Alternativelyfsuch pins enter a parallel sided hole at one end ofgaflask section, and an elongated hole or slot atfthe op- [posite end. 4 To prevent defectivecastings, a high degree of accuracy is required-in the locating devices and if, through normal use or accident,these-pins becomeout of per- 1 sections, the latter either cannot be engaged I 2v0-0r, through binding, may occasion inJury to Furthermore, thefdistance between the censection and the holes of" the "other so that acpendicula'r' with the jointfaces-of the mold the mold when opening and closing the-latter.

tree of the pins or holes varies from timeto time due. to distortionof the ,flask'sections' by the actionof heat, or through shocks sustained When this occurs, the flask se ctions cannot be closedtogether unless there i i'sample clearance between thepins "of one curate jointing of the mold. is impossible.

. The object of the present invention is to provide for use on any ordinary type of flask,

locating means which will I initially. possess and easily retain, a highcdegree. of accuracy,

torted, andwill allow a number of similar sized flasks to be made interchangeable, whilst permitting easy renewalof the locating means the parts become seriouslydamaged' In the accompanying drawings,

Figure 1 is a perspective view showing the registration means on one end of a palr fessential features of each locating device, and

Figure 5 is a part-sectional viewof amodiandtlower sections are accuratelyp'ositioned handles 6cfor lifting purposes 3, whilst the other the lug 9 on the flask 2,

the head.

even if parts thereof become bent, or the flask sections themselves become bodily disand restoration to the initialaccuracy should:

fied-formof the locating device shown in On opposite ends: are provided lugs 7 and 7 'S' inone case,'and.9and-10" in the other.

Totwo of these are secured short and sturdy tion and conveniently are arranged so that one depends from the lug 8 on the upper flask projects upwardly from a Each peg maybe formed with a shank threaded to engage with its supporting lug as shown, or with a plain cylindrical shank, which is a driving fit in the hole in the supporting lug, and-preferably with a collar 12 which abuts the lug or may be sunk therein; The end 13 ofthe peg is spherical or part-spherical, and between this spherical 7 head andthe'collar 12 is a neck 14 which may taper to a reduced size where it joins'with The spherical head of the depending peg shown in Figure 2 engages closely in a socket formed inthe lower lug 7, this socket preferably being constituted by a hardened bush 15 fixed in thelug. The head of the pin,- which also is hardened, may, fit within the socket with a clearance of approximately half of one thousandth of an inch, audit will be seen that owing to the head 13 being spherical (or being part-spherical, as shown "by dotted lines in Figure 3, so that its sides have'a spherical curvature) its engagement in the socket is equally exact whether the aXisof the peg is coincident with that of the socket or whether, through error in manufacture or,

subsequent'distortion, their respective axes are relatively inclined as isindicated by the two axiallines in Figure 3; Such surety of engagement is also achieved'by the formation I of theneck 14 which, being of smaller diam-- eter than the head, is not liable to touch the i "side of the socket even if the peg is tilted relatively thereto. The end of the socket" by which ,the peg enters may be slightly bellmouthed.

The locating device on the opposite end of the flask is shown in Figure 1, the peg employed being preferably identical with that just described but projecting upwardly. The lug 10 with which the peg co-operates is slotted as at 16 so that there is room for relative displacement of the position of the peg in the slot towards or away from the other end of the flask. Extending through each side of the lug 10 into the slot 16 is an adjustable stop 17, the inner ends 18 having flat parallel faces between which the spherical head of the peg isadapted to be engaged with a minimum working clearance. Each of these stops 17 is adapted to be locked by the nut 19 after adjustment for the appropriate clearance.

It is important to notice that the locating pegs are of a short and sturdy nature .and that the actual points of location are-outside the plane of junction of the two mold sections. 7

In using the flask sections embodying the present invention, each is employed in conjunction with a pattern plate having locating devices co-operating with those on the respective flask sections. Thus the mold produced is accurately positioned with regard to the loacting member or members of its particular flask. hen, therefore, the flask sections are assembled, the sections of the mold'are accurately located with reference to one another, even if the individual sections of all the locating members have distorted or become damaged from time to time.

If, therefore, through rough usage or warping of the ends of the flask sections, the longitudinal axes of the pegs areout of perpendicular to the plane of the jointing surface between the flask sections, engagement will nevertheless take place without the least danger of the two sections being relatively movable in the plane of division of the mold. Furthermore, at the end of the flask having the ball-and-socket engagement, shown in Figure 3, .there will be no binding .eflects hindering or preventing engagement owing to the fact that the peg can engage quite freely in the socket even when slightly inclined thereto. It will also be seen that the guiding means for the corresponding peg on the opposite end of the flaskallow for any changes of centres of the two pegs resulting from the possible above-mentioned distortions and that relative movements in any other direction are restrained. Obviously the size of the end faces 18 of the stops 17 is made sufficient to allow for any-such change of centre, and the stops are so mounted in the lug that the faces 18 are at all times parallel with one another. i

It will be understood that if desired instead of the one peg engaging in the socket as shown, it could seat, as shown in Figure 5, in a part-spherical cup 22 and the latter could be arranged to move against a spring 23 in guides 24 perpendicular to the jointing surface between the two flask sections, so as to ensure a firm seating contact.

As the pegs project only a comparatively short distance beyond the jointing face, it is desirable to have additional means whereby the upper flask can be guided with a fair degree of accuracy when connecting it with the lower one. For this purpose, guide pins 20 "(somewhat resembling those ordinarily employed ,asthe locating means for flask sections) are provided. These may be fixed to the lugs in the upper flasktand'are adapted to enter guide holes 21 in the lugs in the slower flask, which provide a side clearance of about a thirty-second of an inch for the pins. Alternatively, and preferably, loose closing pins .may be used in the auxiliary .guide .holesof the lugs; thesecan be an easy;

clearance fit so that there isno possibility of seizing up in the holes. Thus risk of injury of the mold-by contact with cores orp-roject- ,ing parts thereon is prevented by the use 'of the guide pins, and they serve to bring the actual locating means into easy engagement.

It will be seen from the foregoing that the invention ensures, in a cheap and simple manner, accurate location of the several flask sections whether new or after prolonged hard usage, and further it renders similar sized flasks readily interchangeable with one another, so that renewals of broken flasks can be much more cheaply efl'ected than would otherwise be possible. What I claim as my invention andv desire to secure. by Letters Patent of the United States is 1. In a sectional foundry molding flask,

the combination of aball-and-socket register between the flask sections at one end thereof and-.co-operating parts at the other end which are restrained in every direction except longitudinally of the flask sections. v

2. In a sectional foundry molding flask, the combination of a ball on one end of a first section, aco-operatingsocket on the same end of a second section, a second ball at the opposite end of either of said sections and co-operating guides at the same end of the other section parallel to thelength of the flask and restraining the balllaterally. I

3. A sectional foundry molding flask having on one end thereof a ball-and-socket 10-. eating device between the flask sections, and on the otherzend a ball on the one section engaging between guides on the other seca parallel sided socket providing a fixed 1ocation, Whilst the head of the other engages between guide surfaces parallel to the length of the flask. V r

,5. Molding fiasksas claimed in claim 1, in which thelocating device at one end engages pgrallel guides which are relatively adjustr a le.

In testimony whereof I afl'ix my signature;

- EDWARD PLAYER. 

